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To the best of our knowledge, all software in this distribution is freely redistributable (libre, that is, not necessarily gratis), within the Free Software Foundation's definition and Debian Free Software Guidelines. If you find any non-free files included, please contact us (references given below).
That said, MiKTeX has neither a single copyright holder nor a single license covering its entire contents, since it is a collection of many disparate packages. Therefore, you may copy, modify, and/or redistribute software from MiKTeX only if you comply with the requirements placed thereon by the owners of the respective packages.
To most easily learn these requirements, we suggest checking the TeX Catalogue at: http://www.ctan.org/tex-archive/help/Catalogue/catalogue.html (or any CTAN mirror). The Catalogue is also included in MiKTeX in ./texmf/doc/html/catalogue/, but the online version will have updates. Of course the legal statements within the packages themselves are the final authority.
In general, you may redistribute MiKTeX, with or without modification, for profit or not, according to the usual free software tenets. Here are some general guidelines for doing this:
If you make any changes to the MiKTeX distribution
or any package it contains, besides complying with any licensing
requirements, you must prominently mention such changes in your
modified distribution so that users do not take your work for ours,
and know to contact you, not us, in case of questions or problems. A
new top-level README.yourwork file is a
good place to describe the general situation.
Especially (but not necessarily) if changes or
additions are made, we recommend a clearly different title, such as
“Your work, based on MiKTeX
x.y.zzzz (with updates)”, where
x.y.zzzz is the version of MiKTeX you are
publishing. This credits both our work and yours.
You absolutely may not place your own copyright on the entire distribution, since it is not your work (as stated above, MiKTeX is not created by any single person or entity). Statements such as “all rights reserved” and “may not be reproduced” are especially reprehensible, since they are antithetical to the free software principles under which MiKTeX is produced.
You may use any cover or media label designs that you wish. Such packaging and marketing details are not covered by any MiKTeX license.
Finally, we make the following requests (not legal requirements):
Acknowledging that MiKTeX is developed as a joint effort by all TeX user groups, and encouraging the user/reader to join their user group of choice.
The web page http://www.tug.org/usergroups.html may be referenced as a list of TeX user groups. We also appreciate your explicitly listing all the user groups as given on that page, space permitting.
Referencing the MiKTeX home page: http://www.miktex.org/.
Such credits may be placed on the label of your media, your cover, and/or in accompanying text (for instance, in the acknowledgements section of a book).
Finally, although it is certainly not a requirement, we'd like to invite any redistributors to make a donation to the project, whether cash or in-kind, for example via http://www.miktex.org/giveback. Thanks.
If you have any questions or comments, please contact us. In general, we appreciate being given the chance to review any MiKTeX-related material in advance of publication, simply to avoid mistakes. It is much better to correct text on a CD label or in a book before thousands of copies are made!
We are also happy to keep anyone planning a publication informed as to our deadlines and progress. Just let us know. However, you should be aware that MiKTeX is produced entirely by volunteers, and no dates can be guaranteed.
MiKTeX project page: http://www.miktex.org/
The FSF's free software definition: http://www.gnu.org/philosophy/free-sw.html
Debian Free Software Guidelines: http://www.debian.org/intro/free
FSF commentary on existing licenses: http://www.gnu.org/licenses/license-list.html