OSD modification regarding what license can require of user

[Richard Stallman]

The reason we've decided that this ASP requirement is legitimate is
that it is a matter of requiring making the modified source code
available in a case of public use.  It extends existing GPL
requirements coherently to a new scenario of usage.

It would be wrong to require publication of modified versions
that are used privately, but inviting the public to use a server
is not private use.
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