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2  PATENT AND TRADEMARK OFFICE v. BOOKING.COM B. V. 

Opinion of the Court 

“Booking.com”  to  signify  online  hotel-reservation  services 
as a class.  In circumstances like those this case presents, a
“generic.com” term is not generic and can be eligible for fed-
eral trademark registration. 

I 
A 
A  trademark  distinguishes  one  producer’s  goods  or  ser-
vices from another’s.  Guarding a trademark against use by 
others, this Court has explained, “secure[s] to the owner of
the mark the goodwill” of her business and “protect[s] the 
ability  of  consumers  to  distinguish  among  competing  pro-
ducers.”  Park ’N Fly, Inc. v. Dollar Park & Fly, Inc., 469 
U. S. 189, 198 (1985); see S. Rep. No. 1333, 79th Cong., 2d 
Sess., 3 (1946) (trademark statutes aim to “protect the pub-
lic so it may be confident that, in purchasing a product bear-
ing  a  particular  trade-mark  which  it  favorably  knows,  it 
will  get  the  product  which  it  asks  for  and  wants  to  get”). 
Trademark protection has roots in common law and equity. 
Matal v. Tam, 582 U. S. ___, ___ (2017) (slip op., at 2).  To-
day,  the  Lanham  Act,  enacted  in  1946,  provides  federal 
statutory  protection  for  trademarks.  60  Stat.  427,  as 
amended, 15 U. S. C. §1051 et seq.  We have recognized that
federal  trademark  protection,  supplementing  state  law, 
“supports the free flow of commerce” and “foster[s] compe-
tition.”  Matal, 582 U. S., at ___, ___–___ (slip op., at 3, 4–5) 
(internal quotation marks omitted).

The Lanham Act not only arms trademark owners with
federal  claims  for  relief;  importantly,  it  establishes  a  sys-
tem of federal trademark registration.  The owner of a mark 
on the principal register enjoys “valuable benefits,” includ-
ing a presumption that the mark is valid.  Iancu v. Brunetti, 
588 U. S. ___, ___ (2019) (slip op., at 2); see §§1051, 1052. 
The supplemental register contains other product and ser-
vice designations, some of which could one day gain eligibil-
ity for the principal register.  See §1091.  The supplemental