Hi
I find it difficult to understand the terms of use.
I realize that most users just press accept without even reading the terms and without caring if they comply with the terms. That's not me 
Does the following part mean that I am not allowed to use function modules, classes etc. developed by SAP (like CL_GUI_FRONTEND_SERVICES) in software I develop.
Or does it mean that I am not allowed to create a modified copy of programs, function modules, classes etc. developed by SAP?
Or am I allowed to do all of the above mentioned examples as long as I have necessary licences to use the original SAP software or I sell the software, to customers who already have necessary licences to use the original SAP software.
Or does it mean something else?
Nothing in this Agreement shall be deemed to give You the right to modify, copy, distribute, transmit, display, perform, reproduce, publish, license, create derivative works from, transfer, or sell any SAP Software or any other Intellectual Property Rights of SAP for any reason unless otherwise permitted by law. You hereby agree to assign and do assign to SAP any modifications or derivative works of any SAP Software made by You in contravention of this limitation.
And I'm sorry - I do believe I can read English, but I don't understand if this part means, I am allow to provide feedback or other constructiove comments to SCN or not?
You agree not to access or utilize Code Exchange for purposes that are inconsistent with SAP's legitimate business interests. You are permitted to Use Code Exchange only in strict compliance with the terms of this Agreement, so long as that use does not include gathering information for use in any manner which is or could be detrimental to SAP (unless such use is otherwise protected by law), and/or to provide feedback or other constructive comments to SAP (both positive and negative) and the SAP Community Network ("SCN"). Upon at least thirty (30) days prior written notice, SAP may audit You to ensure that You are in compliance with the terms of this Agreement. If You are a Consumer, SAP may audit You to confirm that any Add-ons You have downloaded from Code Exchange are being used in accordance with this Agreement. If You are a Contributor, SAP may audit You to confirm that any software products or components You have uploaded to Code Exchange constitute Add-ons as defined herein, and that such Add-ons were developed under a valid NDLA. Any such audit will be conducted during regular business hours, and will not unreasonably interfere with Your business activities. You will provide SAP with sufficient cooperation for SAP to carry out the audit, and You will provide SAP with adequate access to the relevant records, information, and materials.