CC is licence via a subscription and activate by a sign in with a with a user ID and password that has a subscription. Here is some of my Photoshop System Info the last line I'm including shows my serial number.That is where your serial number is.
Adobe Photoshop Version: 2014.1.0 20140730.r.148 2014/07/30:23:59:59 x64
Operating System: Windows 7 64-bit
Version: 6.1 Service Pack 1
System architecture: Intel CPU Family:6, Model:13, Stepping:7 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2, AVX, HyperThreading
Physical processor count: 12
Logical processor count: 24
Processor speed: 1995 MHz
Built-in memory: 40886 MB
Free memory: 33785 MB
Memory available to Photoshop: 37129 MB
Memory used by Photoshop: 94 %
3D Multitone Printing: Disabled.
Touch Gestures: Disabled.
Windows 2x UI: Disabled.
Image tile size: 1024K
Image cache levels: 4
Font Preview: Huge
TextComposer: Latin
Display: 1
Display Bounds: top=0, left=0, bottom=1080, right=1920
Display: 2
Display Bounds: top=0, left=-1360, bottom=768, right=0
OpenGL Drawing: Enabled.
OpenGL Allow Old GPUs: Not Detected.
OpenGL Drawing Mode: Advanced
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
AIFCoreInitialized=1
AIFOGLInitialized=1
OGLContextCreated=1
NumGLGPUs=1
NumCLGPUs=1
glgpu[0].GLVersion="3.0"
glgpu[0].GLMemoryMB=2048
glgpu[0].GLName="Quadro 4000/PCIe/SSE2"
glgpu[0].GLVendor="NVIDIA Corporation"
glgpu[0].GLVendorID=4318
glgpu[0].GLDriverVersion="9.18.13.4052"
glgpu[0].GLRectTextureSize=16384
glgpu[0].GLRenderer="Quadro 4000/PCIe/SSE2"
glgpu[0].GLRendererID=1757
glgpu[0].HasGLNPOTSupport=1
glgpu[0].GLDriver="nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um"
glgpu[0].GLDriverDate="20140702000000.000000-000"
glgpu[0].CanCompileProgramGLSL=1
glgpu[0].GLFrameBufferOK=1
glgpu[0].glGetString[GL_SHADING_LANGUAGE_VERSION]="4.40 NVIDIA via Cg compiler"
glgpu[0].glGetProgramivARB[GL_FRAGMENT_PROGRAM_ARB][GL_MAX_PROGRAM_INSTRUCTIONS_ARB]=[6553 6]
glgpu[0].glGetIntegerv[GL_MAX_TEXTURE_UNITS]=[4]
glgpu[0].glGetIntegerv[GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS]=[192]
glgpu[0].glGetIntegerv[GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS]=[32]
glgpu[0].glGetIntegerv[GL_MAX_TEXTURE_IMAGE_UNITS]=[32]
glgpu[0].glGetIntegerv[GL_MAX_DRAW_BUFFERS]=[8]
glgpu[0].glGetIntegerv[GL_MAX_VERTEX_UNIFORM_COMPONENTS]=[4096]
glgpu[0].glGetIntegerv[GL_MAX_FRAGMENT_UNIFORM_COMPONENTS]=[4096]
glgpu[0].glGetIntegerv[GL_MAX_VARYING_FLOATS]=[124]
glgpu[0].glGetIntegerv[GL_MAX_VERTEX_ATTRIBS]=[16]
glgpu[0].extension[AIF::OGL::GL_ARB_VERTEX_PROGRAM]=1
glgpu[0].extension[AIF::OGL::GL_ARB_FRAGMENT_PROGRAM]=1
glgpu[0].extension[AIF::OGL::GL_ARB_VERTEX_SHADER]=1
glgpu[0].extension[AIF::OGL::GL_ARB_FRAGMENT_SHADER]=1
glgpu[0].extension[AIF::OGL::GL_EXT_FRAMEBUFFER_OBJECT]=1
glgpu[0].extension[AIF::OGL::GL_ARB_TEXTURE_RECTANGLE]=1
glgpu[0].extension[AIF::OGL::GL_ARB_TEXTURE_FLOAT]=1
glgpu[0].extension[AIF::OGL::GL_ARB_OCCLUSION_QUERY]=1
glgpu[0].extension[AIF::OGL::GL_ARB_VERTEX_BUFFER_OBJECT]=1
glgpu[0].extension[AIF::OGL::GL_ARB_SHADER_TEXTURE_LOD]=1
clgpu[0].CLPlatformVersion="1.1"
clgpu[0].CLDeviceVersion="1.1 CUDA"
clgpu[0].CLMemoryMB=2048
clgpu[0].CLName="Quadro 4000"
clgpu[0].CLVendor="NVIDIA Corporation"
clgpu[0].CLVendorID=4318
clgpu[0].CLDriverVersion="340.52"
clgpu[0].CUDASupported=1
clgpu[0].CUDAVersion="6.5.12"
clgpu[0].CLBandwidth=7.48422e+010
clgpu[0].CLCompute=184.394
License Type: Subscription
Serial number: 96040035116912554961