It seems some people deny really to read clear so here is a bit help: CC-BY-SA-3.0 is an unproblematic license and free, permissive. Just look here. To quote:

Share — copy and redistribute the material in any medium or format for any purpose, even commercially.
  Adapt — remix, transform, and build upon the material for any purpose, even commercially.
  The licensor cannot revoke these freedoms as long as you follow the license terms.

Perhaps some people in some forums outside for some systems should really stop claiming some information without reading the basics. You can always modify the data and share it, when you respect the original license and the people created the data. It is really not that complicated, just that some people seem to have an interest to follow strict what the FSF is naming without questioning the reasons - resulting in ignorance.

4. Restrictions.

b. You may Distribute or Publicly Perform an Adaptation only under: (i) the terms of this License; (ii) a later version of this License with the same License Elements as this License; (iii) a Creative Commons jurisdiction license (either this or a later license version) that contains the same License Elements as this License (e.g., Attribution-ShareAlike 3.0 Unported) ("Applicable License"). You must include a copy of, or the URI, for Applicable License with every copy of each Adaptation You Distribute or Publicly Perform. You may not offer or impose any terms on the Adaptation that restrict the terms of the Applicable License or the ability of the recipient of the Adaptation to exercise the rights granted to that recipient under the terms of the Applicable License. You must keep intact all notices that refer to the Applicable License and to the disclaimer of warranties with every copy of the Work as included in the Adaptation You Distribute or Publicly Perform. When You Distribute or Publicly Perform the Adaptation, You may not impose any effective technological measures on the Adaptation that restrict the ability of a recipient of the Adaptation from You to exercise the rights granted to that recipient under the terms of the Applicable License. This Section 4(b) , applies to the Adaptation as incorporated in a Collection, but this does not require the Collection apart from the Adaptation itself to be made subject to the terms of the Applicable License.

(ii) a later version of this License with the same License Elements as this License;

Version 3.0

Your contributions to adaptations of BY-SA 3.0 materials may only be licensed under:

    BY-SA 3.0, or a later version of the BY-SA license.
    Ported versions of the BY-SA license, version 3.0 or later.
    A license designated as a “Creative Commons Compatible License” as defined in BY-SA 3.0.

Currently, no non-CC licenses have been designated as compatible with BY-SA 3.0. Other licenses may be added to this list at any time according to the established process and criteria. Once a license has been added to this list, it will not be removed.

Creative Commons Attribution-Sharealike 4.0 license (a.k.a. CC BY-SA) (#ccbysa)

    This is a copyleft free license that is good for artistic and entertainment works, and educational works. Like all CC licenses, it should not be used on software.

    CC BY-SA 4.0 is one-way compatible with the GNU GPL version 3: this means you may license your modified versions of CC BY-SA 4.0 materials under GNU GPL version 3, but you may not relicense GPL 3 licensed works under CC BY-SA 4.0.

    Because Creative Commons lists only version 3 of the GNU GPL on its compatible licenses list, it means that you can not license your adapted CC BY-SA works under the terms of “GNU GPL version 3, or (at your option) any later version.” However, Section 14 of the GNU GPL version 3 allows licensors to specify a proxy to determine whether future versions of the GNU GPL can be used. Therefore, if someone adapts a CC BY-SA 4.0 work and incorporates it into a GNU GPL version 3 licensed project, they can specify Creative Commons as their proxy (via https://creativecommons.org/share-your- … licenses/) so that if and when Creative Commons determines that a future version of the GNU GPL is a compatible license, the adapted and combined work could be used under that later version of the GNU GPL.

    Please be specific about which Creative Commons license is being used.

Version 4.0 of CC’s Attribution-ShareAlike (BY-SA) license is one-way compatible with the GNU General Public License version 3.0 (GPLv3). This compatibility mechanism is designed for situations in which content is integrated into software code in a way that makes it difficult or impossible to distinguish the two. There are special considerations required before using this compatibility mechanism. Read more about it here.

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