In the newest firmware (5.4.5), Hikvision has included Open Source disclosures in their IP cameras (found in Configuration > System Settings > About Device).

The relevant sections are shown here (with highlights for specific applications / software) :

Open Source Software Licenses

The information in this document applies to IP CAMERA

1. Software Licensed under the GNU General Public License

This product includes software licensed under the GNU General Public
License (GPL), Version 2. Please see Appendix A below for the terms
of this license.

Specifically, the following software included in this product is
subject to the GPL:

GCC library (note that an exception clause applies, see Appendix B)
Linux kernel
busybox 1.19.3
u-boot
udev 114
IPTables 1.4.18
ppp - Pauls PPP Package 2.4.3
RP PPP OE 3.8
wpa_supplicant 0.7.2

All software listed above is copyright by the respective author.
Please see the source code for detailed information.

2. Software Licensed under the GNU Library General Public License

This product includes software licensed under the GNU Library
General Public License (LGPL), Version 2. Please see Appendix C
below for the terms of this license.

Specifically, the following software included in this product is
subject to the LGPL:

libiconv 1.9.2

All software listed above is copyright by the respective author.
Please see the source code for detailed information.

3. Software Licensed under the GNU Lesser General Public License

This product includes software licensed under the GNU Lesser
General Public License (LGPL), Version 2.1. Please see Appendix F
below for the terms of this license.

Specifically, the following software included in this product is
subject to the LGPL:

GNU C library

All software listed above is copyright by the respective author.
Please see the source code for detailed information.

4. Software Licensed under a modified BSD License

This product includes the following software licensed under a modified
BSD license.

libxls 1.4.0
libUPnP 1.6.19
sqlite 3.7.10

Please see Appendix J below for the terms under which this software
is distributed.


5. Software Licensed from The OpenSSL Project

This product includes the following software copyright by The OpenSSL
Project:

OpenSSL 1.0.1l

Please see Appendix I below for the terms under which this software is
distributed.

6. Disclaimer

All software listed in the above is provided without any liability
or warranty from their copyright holders.