GPL and LGPL

GNU General Public License

GPL is something that primarily comes in mind whenever we think about free software licenses.
The salient features of the GPL are

• Copy the software.
  
• Distribute the software however you want.
   
• Charge a fee to distribute the software.
   
• Make whatever modifications to the software you want. 

You can find the legal text for the GPL here. There are also other restrictions and there's quite a nice human-readable version at the Creative Commons site.

The GNU Lesser General Public License

Anther GNU license which is sister to the GPL is Lesser General Public Licence (LGPL).
It grants fewer rights to a work than the standard GPL.
LGPL allows the product to have link with commercial and propitiatory software which GPL prohibits.
The restriction here is that the product should be released under LGPL
Again, there's a nice friendly look at this on the Creative Commons site.

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