Are you sure that GNU GPL Section 1 is met by CrossLoop?
Yes. The binary distribution of TightVNC fully complies with the GNU GPL. The GNU GPL Section 1 states: 1. You may copy and distribute verbatim copies of the Program’s source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. The CrossLoop website includes both the binary and source code of the TightVNC GPL program (see above). The CrossLoop installer requires that the user accept both the CrossLoop license and the TightVNC GPL license. The download also includes a copy of the GPL license.