A popular non-copyleft free software license. It has the advantage of never having had anything like a BSD advertising clause, so there's no confusion as to GNU GPL compatibility.

Copyright © $FIRSTPUB_YEAR $OWNER; All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL $OWNER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of $OWNER shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from $OWNER.

However, I see a possible interpretation that makes this at least a lesser copyleft (of the sort granted by the GNU Lesser General Public License). It requires copies to reproduce the grant of permission to modify. This is incompatible with any EULA terms prohibiting reverse engineering.

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