Is it illegal to make a PDF version of a book for uploading and downloading?

Illegal. Mainly there is no saying of avoiding risks. But mainly depends on whether the obligee investigates.

According to the Copyright Law (Note "(6) Distribution Right")

Article 10 Copyright includes the following personal rights and property rights:

(a) the right to publish, that is, the right to decide whether the work is open;

(2) the right of signature, that is, the right to indicate the identity of the author and sign his name on the work;

(3) the right to modify, that is, the right to modify or authorize others to modify a work;

(four) the right to protect the integrity of the work, that is, the right to protect the work from distortion and tampering;

(5) the right of reproduction, that is, the right to make one or more copies of a work by means of printing, photocopying, rubbing, audio recording, video recording, reproduction or reproduction;

(6) the right of distribution, that is, the right to provide the original or duplicate of a work to the public by way of sale or gift;

(7) the right to rent, that is, the right to temporarily license others to use film works, works created by methods similar to filming, and computer software, except that computer software is not the main object of rent;

(8) The right to exhibit, that is, the right to publicly display the original or duplicate of an artistic work or photographic work;

(nine) the right to perform, that is, the right to publicly perform a work and publicly broadcast the performance of the work in various ways;

(10) the right of projection, that is, the right to publicly copy art, photography, movies and works created by methods similar to filming through projectors, slide projectors and other technical equipment;

(11) Broadcasting right, that is, the right to publicly broadcast or disseminate works by wireless means, broadcast works to the public by wired or rebroadcast means, and broadcast works to the public through loudspeakers or other similar tools for transmitting symbols, sounds and images;

(12) the right of information network communication, that is, the right to provide works to the public by wired or wireless means, so that the public can obtain works at the time and place they choose;

(13) the right to make a film, that is, the right to fix a work on a carrier by making a film or by similar methods;

(14) the right of adaptation, that is, the right to change a work and create a new work with originality;

(15) the right to translation, that is, the right to convert a work from one language into another;

(16) the right of assembly, that is, the right to assemble a work or fragments of a work into a new work through selection or arrangement;

If the following conditions exist:

Article 22 Under the following circumstances, a work may be used without permission and without payment to the copyright owner, but the name of the author and the title of the work shall be indicated, and other rights enjoyed by the copyright owner in accordance with this Law shall not be infringed:

(a) for personal study, research or appreciation of the use of other people's published works;

(2) appropriately quoting published works of others in works for the purpose of introducing and commenting on works or explaining problems;

(3) inevitably copying and quoting published works in newspapers, periodicals, radio stations, television stations and other media in order to report current news;

(4) Newspapers, periodicals, radio stations, television stations and other media publish or broadcast current affairs articles on political, economic and religious issues that have been published by other newspapers, periodicals, radio stations, television stations and other media, unless the author declares that they are not allowed to publish or broadcast;

(5) Newspapers, periodicals, radio stations, television stations and other media publish or broadcast speeches delivered at public meetings, unless the author declares that they are not allowed to publish or broadcast;

(6) Translating or reproducing a few published works for classroom teaching or scientific research in schools for use by teaching or scientific researchers, but not publishing them;

(seven) the use of published works by state organs within the reasonable scope of performing official duties;

(eight) libraries, archives, memorial halls, museums, art galleries, etc., in order to display or save the version, copy the works collected by the library;

(9) Performing published works for free, without charging fees to the public or paying remuneration to the performers;

(ten) copying, painting, photography and video recording of works of art set up or displayed in outdoor public places;

(eleven) China citizens, legal persons or other organizations written in Chinese and published in China;

(12) Published works are published in Braille. )