Digital currency docking between Zhengtong electronics and Nanji
Generally, the excellent digital currencies are mostly imported procts, such as bitcoin, Leyte coin, ether coin and so on. However, the domestic Yuanbao coin, Ruitai coin, bitcoin and the tokens of different crowdfunding projects of European crowdfunding are excellent digital currencies
digital currency (English: digital currency) is an alternative currency in the form of electronic currency. At present, no central bank of any government has indicated that it will issue digital currency, and digital currency does not have to have a benchmark currency and a central bank
it is different from the virtual currency in the virtual world, because it can be used for real goods and services transactions, not limited to online games. The early digital currency (digital gold currency) is a form of electronic currency named after the weight of gold. Today's digital currency, such as bitcoin, lightcoin and ppcoin, is an electronic currency created, issued and circulated by check sum cryptography
there is no unified concept of legal digital currency. The Bank of England defines "digital currency" as "a payment method existing only by electronic means... Which can be used to purchase physical goods and services"... Including "private digital currency" and "digital currency issued by the central bank". Further than the Bank of England, Yao Qian, director of the digital currency Research Institute of the people's Bank of China, made clear the multiple connotations of the central bank's legal digital currency in several public speeches: legal and encrypted credit currency, adopted a series of algorithms, and derived more intelligent functions in the payment function
to this end, the central bank has designed a system architecture of "one currency, two warehouses and three centers", that is, taking digital currency as the center, designing the issuing library and deposit library, matching the certification center, big data analysis center and registration center. The central bank's digital currency is issued by the central bank and circulated in the commercial bank's account. The issuing inventory is put into the people's Bank of China to deposit the digital currency. The deposit bank is the database of the commercial bank to deposit the central bank's digital currency. The authentication center manages the identity of institutions and users in a centralized way; The registration center completes the whole life cycle and ownership registration of the central bank's digital currency; The big data analysis center achieves the goals of anti money laundering, anti terrorist financing, index detection and analysis
as an important node in the framework of legal digital currency, commercial banks play an important role in the circulation of central bank's digital currency. In the case that China's non bank payment institutions have occupied a certain market share, it is a better choice for non bank payment institutions to participate in the framework of digital currency operation as a supplement to commercial banks. The reasons are as follows: first, third-party payment institutions can help commercial banks realize the promotion of legal digital currency. Within commercial banks, there is a competitive relationship between legal digital currency and physical currency. The public tends to convert the digital currency in cash account into traditional currency in exchange for income, so it is difficult to achieve the goal of promoting digital currency by commercial banks; Second, the third-party payment institutions can avoid the repeated construction of payment application scenarios by commercial banks. Different from non bank payment institutions, the current payment scenarios of commercial banks are relatively lack of diversification, which will lead to a waste of resources and the rich experience accumulated by non bank payment institutions; Third, the third-party payment institutions can appropriately rece the operating costs of commercial banks. On the one hand, commercial banks need to upgrade the necessary software and hardware for the central bank's digital money service; On the other hand, we should continue to do a good job in traditional RMB deposit and withdrawal services. The simultaneous operation of the two systems will increase a lot of human and material costs. Fourth, the third-party payment institutions can promote the construction of payment instruments and channel integration of commercial banks. In the framework of legal digital currency, the single payment instruments and complex payment channels provided by commercial banks may rece the enthusiasm of the public to use legal digital currency
2 the emergence of legal digital currency reshapes the role of non bank payment institutions
in the process of cooperation with commercial banks, all kinds of non bank payment institutions play four roles. The first is the role of account manager. Non bank payment institutions can not operate deposit and loan business, and the amount in their payment account is not a deposit, so it is easier for the public to accept the role of non bank payment institutions as "digital wallet". At the same time, non bank payment institutions have rich experience in the development and operation of digital currency wallets and their terminals, which is concive to the smooth management and use of central bank's digital currency, and there is no need to worry about the risk of misappropriation of funds by non bank payment institutions. The second is the role of payment service provider. Non bank payment institutions have a lot of experience in scenario development and operation, including mobile payment, cross-border payment and rural payment, and relatively large market share of scenario based payment. On the one hand, powerful non bank payment institutions can develop a variety of procts based on Intelligent legal digital currency to meet the needs of users' exchange, payment, storage and related derivatives; On the other hand, non bank payment institutions can make use of various scenarios to promote the use of legal digital currency. For example, when consumers want to invest through the central bank's digital currency, non bank payment institutions, with the experience of traditional currency investment and payment services and upgraded digital wallet, can be fully competent as the special payment service provider of digital currency investment. Third, the role of system construction service provider. NPC, the core of national payment and settlement system, and CCPC, the core of provincial payment and settlement system, will continue to play an important role in the framework of legal digital currency. In the long-term coexistence of legal digital currency and traditional currency, NPC and CCPC will be double important nodes. Non bank payment institutions with strong technical ability can be used as secondary verification nodes under the framework of legal digital currency to supplement the multi center and distributed system architecture and continue to dock with NPC and CCPC
3 technical connection between non bank payment institutions and legal digital currency system
the innovation of non bank payment institutions is accompanied by the connection with legal digital currency system, covering the whole process of digital currency generation, storage, use and withdrawal. In this process, the first thing to solve is the docking of basic layer technology and transaction mole. The docking of basic layer technology is reflected in three aspects. First, in terms of basic security technology, non bank payment institutions, as providers of mobile terminal transaction forms, need to apply terminal security mole technology, dock with unified encryption and decryption system, provide carriers for secure storage and encryption and decryption operations, and provide effective basic security protection for digital currency. Secondly, in the aspect of data security technology, non bank payment institutions, as a part of the whole payment system, should adopt the official unified ciphertext + MAC / ciphertext + hash technology to transmit digital currency information, so as to ensure the confidentiality, security and non tamperability of the information. Thirdly, in the aspect of transaction security technology, non bank payment institutions, as the advanced nodes participating in bookkeeping, adopt blind signature technology to ensure the controllable anonymity of digital currency in the process of transaction, and eliminate the possibility of repeated payment through serial number, time stamp and other ways; And through encryption and decryption, digital signature, identity authentication and other anti-counterfeiting ways to ensure the authenticity of the transaction
when docking with the transaction mole, non bank payment institutions should do the following: first, docking with the certification center to obtain relevant digital certificates and user identity information; Second, connect with the trusted service management mole to obtain the use function of digital currency; Third, connect with the issuing system and storage system, and apply for and exchange digital currency through the bank treasury; Fourth, connect with the transaction communication mole to ensure that users can realize online payment through the transaction network in the intelligent terminal based on online transaction communication; Fifth, connect with the registration center, notify and record the flow of digital currency transactions, so as to complete the registration of the central bank's digital currency generation, circulation, checking and extinction process
4 scenario docking between non bank payment institutions and legal digital currency system
scenario docking of non bank payment institutions is based on the transformation of their own roles. Legal digital currency is algorithmic currency and intelligent currency, so business innovation and scenario expansion are the proper meaning of legal digital currency system. Non bank payment institutions can achieve scene docking mainly in four aspects
first, enabling the financial instry and defusing the limitations of financial scenario services. At present, there are some limitations in financial scenario service, such as business modeling is not universal, different agents have different management requirements, and the system docking cost of participants is high. Non bank payment institutions connect with the underlying technology of legal digital currency, and through the research and development of smart contract, establish behavior information such as capital flow, trigger conditions, value change rules, revenue right registration, and corresponding capital information (amount, account, currency, etc.) to resolve the existing limitations of financial scenario service. Non bank payment institutions use the atomic properties of digital currency and the atomic transactions of smart contracts to "assemble" into a business model. It does not need to develop a separate platform for different business scenarios, and avoids the monopoly of the instry platform and the non disclosure of information
Second, expand the use scenarios and improve the user experience. Non bank payment institutions can continue to expand the use scenarios according to the characteristics of legal digital currency on the basis of the existing rich payment scenarios, so as to meet the needs of users' exchange, payment, storage and related derivatives. At the same time, through the aggregation application, users can use the app of non bank payment institutions to dock a large number of scenarios and services
thirdly, improve the security of funds and create a universal digital wallet. Non bank payment institutions can provide digital wallet services, create digital wallets that meet security standards through their own technology, and ensure the security of users' funds. Alternative methods include: the central bank and non bank payment institutions cooperate to develop a unified universal digital wallet application, or authorize several qualified non bank payment institutions to provide universal digital wallet services. The digital wallet can realize the mutual exchange between the user's funds in various commercial banks and the legal digital currency even in the self owned accounts of non bank payment institutions. From the perspective of implementation, at the same time, the traditional account system of commercial banks can also bind the digital currency wallet of non bank payment institutions, so as to achieve the joint management of traditional accounts bound with digital currency wallet
Fourth, help cross-border settlement and build a safe and reliable cross time zone alliance chain. Non bank payment institutions can deeply participate in the cross-border payment system of legal digital currency. Cooperation with commercial banks and central banks can be achieved in at least two aspects. First, payment standards and tools are available. Non bank payment institutions participate in the research and establishment of standards and tools to realize the possibility of technical docking. Second, cross border payment system. The business system led by the central bank and participated by commercial banks and qualified non bank payment institutions will help to realize efficient cross-border payment
5 the legal framework of non bank payment institutions and legal digital currency is connected
a perfect legal system is an important guarantee for the operation of the digital currency system. There are several key questions to answer. First, how to determine the ownership of legal digital currency? This is the basis of all legal acts of legal digital currency. The first way of thinking is that legal digital currency is intangible. As a special movable property, it is applicable to the provisions of the property law. For example, Liu Xiangmin, director of the Department of articles and law of the people's Bank of China, believes that "to solve the problem of ownership transfer of digital currency, we should also focus on the publicity of ownership." The second idea is that digital currency is an electromagnetic record, which is applicable to the law of data transfer and transaction. The essence of digital currency is electromagnetic recording, and the transfer of electromagnetic recording content is recorded in the node of digital currency technology architecture. The change of node records is taken as the standard of ownership transfer. Second, how to protect personal information security? Personal information security is a basic problem in the era of digital economy. In addition to legislation to improve the level of technical security, we should also make clear the main types of legal digital currency system
data sources: the following information comes from enterprise credit reference institutions, more detailed enterprise risk data, company official website, company profile, which can be inquired on nailing enterprise dictionary, and more company recruitment information can be inquired on the company official website< br />
• Company profile:
Shenzhen Zhengtong Electronic Co., Ltd. was established on September 4, 1993, with a registered capital of 515156948 million yuan, and its legal representative is Zeng Shengqiang. Its address is 18 / F, West Coast Building, Yuehai street, Nanshan District, Shenzhen city. Its unified social credit code and tax number are 91440300279402305l, and its instry is information transmission, software and information technology services, The registration authority is Nanshan Bureau, and its business scope is the development, sales, leasing, maintenance, operation, marketing promotion and service of computer software, hardware, peripheral equipment, electronic procts, self-service equipment and accessories, financial machinery and equipment, communication equipment, financial payment terminal equipment, office supplies and consumables; Computer system integration and technical services; LED lighting, urban road lighting engineering, wind and solar power generation equipment, solar energy application system and related application engineering, development and sales of automotive electronic procts; Energy saving scheme consultation; Provide energy-saving services, energy monitoring, energy management, equipment maintenance services and EMC contract energy management services for enterprises and institutions; Self owned house leasing; Import and export business (according to smgdz No. 2001-101 qualification certificate for details); Equipment leasing (equipment leasing scope: electronic procts, self-service equipment and accessories, financial equipment, communication equipment); R & D, sales, leasing, technical consultation and technical services of robot system, intelligent robot, intelligent Electromechanical, automation procts and Internet of things technology; Information technology consulting service, commodity information consulting service, science and technology information consulting service, enterprise management consulting service (excluding restricted items); and; Data processing and storage services; Data center operation and maintenance services; Database technology services, data processing and other information technology and business process outsourcing services; Data center construction planning, operation and service outsourcing; Development, sales and leasing of cloud computing technology and related procts; estate management; Construction and design of mechanical and electrical engineering, construction engineering, building decoration engineering, environmental protection engineering, municipal public engineering, municipal comprehensive engineering, etc; Landscape planning, environmental art, planning and design design and engineering construction; R & D, sales, construction and maintenance of smart city management system; Design, construction and maintenance of safety technology prevention system^ Computer software, hardware, peripheral equipment, electronic procts, self-service equipment and accessories, financial equipment, communication equipment, financial payment terminal equipment, office supplies, consumables proction; The development, proction, sales, maintenance and related technical consultation and operation and maintenance of commercial password procts approved by the State Password Administration (all of the above items do not include restricted items); LED lighting, urban road lighting engineering, wind and solar power generation equipment, solar energy application system and related application engineering, automobile electronic procts proction; Design, implementation and operation of energy management scheme; Proction of robot system, intelligent robot, intelligent mechatronics, automation procts and Internet of things technology; Internet data transmission service and access service; Internet data center operations; Provide parking service for motor vehicles; Proction and maintenance of electronic and intelligent engineering, new energy vehicle charging pile and supporting equipment., The instrial and commercial registration number of Shenzhen Zhengtong Electronic Co., Ltd. is 440301103106038
&; Branches:
Cheng Branch of Shenzhen Zhengtong Electronic Co., Ltd., registration number 510105000308015, unified social credit code 91440300279402305l
Guangming branch of Shenzhen Zhengtong Electronic Co., Ltd., registration number 440301106754115, The unified social credit code is 91440300279402305l
Hefei Office of Shenzhen Zhengtong Electronic Co., Ltd., the registration number is 340100000654870, the unified social credit code is 91440300279402305l
Hunan Branch of Shenzhen Zhengtong Electronic Co., Ltd., the registration number is 4301000000161784, The unified social credit code is 91440300279402305l
Shenyang Branch of Shenzhen Zhengtong Electronic Co., Ltd., the registration number is 210105100029819, and the unified social credit code is 91440300279402305l
; Foreign investment:
Shanghai Zhengtong communication equipment Co., Ltd., legal representative is Zeng Shengqiang, investment date is February 11, 2004, enterprise status is cancellation, registered capital is 50 million, investment proportion is 100%
Shenzhen Qianhai Yousheng Capital Management Co., Ltd., legal representative is Wu Yong, investment date is June 16, 2014, enterprise status is in business (opening), Jiangsu Zhongmao energy saving and environmental protection instry venture capital fund partnership (limited partnership), with a registered capital of 1000 million yuan and a contribution ratio of 30.00%
the legal representative is Jiangsu Zhongmao Venture Capital Management Co., Ltd., and the appointed representative is Xu Tao, with a contribution date of June 3, 2014, a business status of being in business (opening), and a registered capital of 46245.570000 yuan, The investment proportion is 6.49%
Changsha zengtong cloud computing Co., Ltd., the legal representative is Xu Zhongci, the investment date is November 26, 2015, the enterprise status is in business (opening), the registered capital is 30000 million, the investment proportion is 100.00%
Guangdong Hongda Communication Co., Ltd., the legal representative is Xu Zhongci, the investment date is August 28, 2000, the enterprise status is in business (opening), The registered capital is 2657 million, the proportion of investment is 55.78%
Dingzhou bid winning Energy Saving Technology Service Co., Ltd., the legal representative is Xu Yanni, the investment date is 2014-07-08, the enterprise status is in operation (opening), the registered capital is 50 million, the proportion of investment is 100.00%
Guangzhou yunshuo Technology Development Co., Ltd., the legal representative is Xu Zhongci, the investment date is 2013-04-25, The status of the enterprise is in business (opening), the registered capital is 9080 million, and the proportion of investment is 70.00%
Shenzhen Zhengtong Jiaming optoelectronics Co., Ltd., the legal representative is Zeng Shengqiang, the date of investment is March 12, 2010, the status of the enterprise is in business (opening), the registered capital is 2000 million, and the proportion of investment is 100.00%
Guangzhou Zhengtong Network Technology Co., Ltd., and the legal representative is Zhang Jinhong, Wuhan Zhengtong Electronic Co., Ltd., legal representative Zeng Shengqiang, investment date 2000-02-24, enterprise status cancellation, registered capital 40 million, investment ratio 100%
Shenzhen Zhengtong Digital Technology Co., Ltd., legal representative Zeng Shengqiang, Shenzhen Zhengtong Purun Electronics Co., Ltd., whose legal representative is Zeng Shengqiang, whose investment date is August 13, 2003, whose enterprise status is in business (opening), whose registered capital is 400 million and investment proportion is 51.00%
Shenzhen Tongxinyuan Property Management Co., Ltd, The legal representative is Zeng Shengqiang, the date of contribution is June 22, 2010, the status of the enterprise is in business (opening), the registered capital is 8700 million, and the proportion of contribution is 32.29%
Guizhou Zhengtong optoelectronics Co., Ltd., the legal representative is Zhang Zhong, the date of contribution is March 27, 2017, the status of the enterprise is in business (opening), and the registered capital is 10 million, The investment proportion is 100.00%
Sichuan shuxinyi e-commerce Co., Ltd., the legal representative is Zhang Jinhong, the investment date is October 30, 2015, the enterprise status is in business (opening), the registered capital is 5000 million, the investment proportion is 60.00%
< P > Guangzhou crystal Zhilian Technology Co., Ltd., the legal representative is Li Hong, the investment date is September 25, 2017, the enterprise status is in business (opening), The registered capital is 1500 million, and the proportion of contribution is 15.00%Shenzhen Zhengtong cloud computing Co., Ltd., the legal representative is Xu Zhongci, the date of contribution is September 13, 2016, the enterprise status is in operation (business), the registered capital is 10000 million, and the proportion of contribution is 100.00%
Jiangsu Ruibo Data Technology Co., Ltd., the legal representative is Tao min, and the date of contribution is August 10, 2012, Changsha Zhengtong Electronic Co., Ltd., with its registered capital of 2234.042500 and investment ratio of 15.65%
is in business (business operation), its legal representative is Zeng Shengqiang, and its investment date is April 7, 2000, its enterprise status is cancellation, its registered capital is 30.000000, and its investment ratio is 100.00%
Shenzhen Zhengtong Jinxin Technology Co., Ltd., with its legal representative Zeng Shengqiang, and its investment date is August 6, 2003, The status of the enterprise is in operation, the registered capital is 10000 million yuan, and the contribution ratio is 100%; Shareholders:
the proportion of capital contribution is 84.36% for the tradable shares with unlimited sales conditions, the amount of capital contribution is 43458.761400
the proportion of capital contribution is 15.64% for the tradable shares with limited sales conditions, and the amount of capital contribution is 8056.933400
&; Senior executives:
MA Yingbing is a director of the company
Zhong Yan is a supervisor of the company
Zhang Yuehua is a director of the company
Zeng Shengqiang is a general manager of the company
Zeng Shengqiang is a chairman of the company
Fang Jin is a director of the company
Xu Zhongci is a director of the company
< P > Huang Hong is a supervisor of the companyDeng hongzai Director of the company
Xue Ning is a supervisor of the company
SUN Haifa is a director of the company
digital certificate
. As long as the boss does not lend the certificate, others can not be operated, of course, it is safe.
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valid ID cards include: resident ID card, temporary ID card, household register, travel card, military security card, officer card, armed police officer card, soldier card, military cadet card, military civilian cadre card, military retired cadre card, valid passport that can be used according to regulations, residence card for Hong Kong, Macao and Taiwan residents, mainland pass for Hong Kong and Macao residents, Hong Kong and Macao pass for Hong Kong and Macao residents Pass for Taiwan residents to travel to the mainland and pass for mainland residents to travel to Taiwan
there are 25 kinds of Alien Residence Permit (including alien permanent residence permit and alien permanent residence identity card), alien exit and entry permit, diplomat's card, consulate's card, seafarer's card, alien's identity certificate issued by the Ministry of foreign affairs, passport loss report certificate issued by the exit and Entry Administration Department of local public security organ, and temporary identity certificate issued by railway public security department for taking passenger train, The valid ID card of minors over 1.5m and under 16 years old also includes the student card.
December 18, 2007, listed on Shenzhen Stock Exchange, stock code: 002197. The company is mainly committed to proct R & D, proction, sales and application integration services in the secure payment instry and self-service instry. Among them, the company's annual proction capacity of communication procts and password keyboards is 1 million; The annual proction capacity of self-service procts is 100000 sets; The annual proction capacity of traditional financial payment procts is 1 million
as an instry leader in the field of financial payment information security and a domestic first-line self-service equipment provider, the company has obtained more than 20 domestic bank terminal equipment selection qualifications in the financial field, and has successfully ranked among the top three domestic bank self-service equipment suppliers. In the field of communication, public security, urban informatization and other public services, the company provides multi instry and multi type self-service equipment
as the largest self-service proct instry base in China with complete instrial chain, the company's proct footprint covers 31 provinces and autonomous regions in China, and a number of internationally competitive procts have been successfully exported to more than 160 countries and regions in the world
as a high-tech enterprise recognized by Shenzhen municipal government, undertaking unit of Shenzhen high-tech instrialization demonstration project, undertaking unit of innovation fund support project of the Ministry of science and technology, undertaking unit of electronic development fund support project of the Ministry of information instry, director unit of China Automatic Identification Technology Association, sponsor unit and director unit of Shenzhen computer public network security association The company is the designated unit of R & D, proction and sales of national commercial password procts, and the convener of national standard for commercial password procts. A number of procts of the company have been certified by China and international bank card organizations (visa EPP, PCI EPP, EMV), and a number of procts have obtained the security proct sales license issued by the Ministry of national security; It is the demonstration unit of national high-tech instrialization development project and the instrialization base of national financial payment information security procts
the company has a group of high-quality engineering and scientific research personnel, more than 70% of whom have more than 5 years of experience in technology development and project management of self-service system in finance and various instries, and can independently undertake the research and development and proction of core technology< At present, the company has set up 25 after-sales service centers and 89 after-sales service outlets in Shenzhen, Guangzhou, Beijing, Wuhan, Shanghai, Changsha, Xi'an, Shenyang and Cheng, covering the whole country. National free customer service line, 24 hours a day to provide users with after-sales technical service support
the headquarters is located at 18-19 floors, West Coast Building, Nanhai Avenue, Nanshan District, Shenzhen, with a total area of 2000 square meters; Zhengtong electronic new instrial park was officially put into use in May 2010, with an area of 110000 square meters, located in jiazitang, Song Road, Guangming New District, Shenzhen
"create a world famous brand, build a century old shop", Zhengtong people will be in the spirit of integrity, dedication, team and innovation to build the world's largest and strongest financial equipment, procts and solutions provider
Because Microsoft office or any domestic office software itself does not have the printing control function, in practical application, if there is no printing control measure for the document with electronic seal, and directly use the printing function of office itself to print the document, it will lead to the following problems, However, it is not accepted by user units:
1) when the file is modified, it can be printed: when the content of the document is changed, it can still be printed, because office itself does not verify the document before printing, which will lead to the proliferation of fake red header files, even if it is not malicious counterfeiting, it will also lead to the inconsistency between electronic documents and paper documents
2) it is impossible to control the number of printed copies: China is an ancient civilization with thousands of years of seal tradition, and seal represents both authority and legitimacy. Therefore, our country has a strict proction approval system for the seal, and the seal using unit has also formulated a strict seal custody and seal using system. The purpose is to ensure the safety of seal use, prevent the abuse of seal, and rece the responsibility of seal use to the minimum. Compared with the management of physical seal, the security of electronic seal can be well controlled through strict management and use control. However, if the print output of the document with electronic seal is not controlled, the user can print the paper document with red seal at will, which will easily cause confusion
in order to prevent getting paper documents with red seal from office documents that have been signed, we control the printing of the signed office documents as follows:
u block the printing function of office itself: as long as the office documents contain electronic seals, the signature software automatically blocks the printing functions of office, Users can't print documents arbitrarily through the printing function of office
u added a custom print control function: the "document print" function is added to the signature software, and only through this print function can the signed office document be printed
u only those who hold USBKEY with printing permission can print office documents with electronic signature
u legal printers will write a complete print log in the background seal management system every time they print
u you can specify that only a limited number of copies of a specific document can be printed, or you can prohibit printing or not limit the number of copies to be printed, which is completely controlled according to the actual requirements of users
u after the electronic signature software is unloaded, the signed office documents can be opened normally and cannot be modified, but the seal is automatically displayed in black. Therefore, it is impossible to get the paper documents with red seal by using the office printing function, which can effectively prevent the red seal documents from flowing and ensure the security
u provides two ways to bind printers through interface functions:
A. This method is simple and easy to implement by calling specific printers through interface functions
B. by modifying the printer driver to bind a specific printer, this method is more secure and reliable, but requires unified purchase of printers
through this design control, the printout of the signature document can be strictly controlled, and the source of any printed can be traced. In this way, the safety of printing is guaranteed to the greatest extent
on the basis of this standard design, anzhengtong can also formulate more targeted printing control mode according to the special application requirements of users in some special occasions
for an introction to the security of paper documents printed from electronic documents, please refer to the chapter of anti counterfeiting solutions for paper documents